Polarizing light splitting device

Abstract

The present invention provides a polarizing light splitting device comprising: a polarizing beam splitter, a polarizing rotator and a single polarization light splitter that are arranged in sequence.The device is small in additional loss and high in polarization extinction ratio, an input light beam in any polarization state can be split into two beams of linearly polarized lights, a light splitting ratio is hardly affected by the polarization state of an incident light beam, and the device is high in wavelength bandwidth and can be widely applied to the fields of optical fiber communications, optical fiber sensing, scientific research and the like.

Description

technical field [0001] The invention relates to the technical fields of optical communication and optical fiber sensing, in particular to a polarization splitting device. Background technique [0002] Currently, on the market, most optical splitters are single-function optical power splitting or polarization beam splitting products, but there are few reports on low-loss polarization-independent one-to-two optical splitters that have both optical power splitting and polarization beam splitting functions. Among the existing products, the lithium niobate Y waveguide is a beam splitter in the inertial navigation fiber optic gyroscope with both polarization beam splitting and optical power splitting functions. It has a high extinction ratio, but has a large insertion loss. In addition, the lithium niobate Y waveguide only allows the waveguide mode of a single polarization to pass through, so there is always an inherent insertion loss close to 3dB for low-polarization light source...

AI Technical Summary

Problems solved by technology

[0002] Currently, on the market, most optical splitters are single-function optical power splitting or polarization beam splitting products, but there are few reports on low-loss polarization-independent one-to-two optical splitters with both optical power splitting and polarization beam splitting functions.

Among the existing products, the lithium niobate Y waveguide is the optical splitter in the inertial navigation fiber optic gyroscope, which has the functions of polarization beam splitting and optical power splitting at the same time. It has a high extinction ratio, but the insertion loss is very large.

And the lithium niobate Y waveguide only allows the waveguide mode of a single polarization to pass through, so there is always an inherent insertion loss close to 3dB for low-polarization light sources, which directly affects the performance of the fiber optic gyroscope

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